It isn't defined what happens if StructuredSerialize in measure() throws an exception

[smaug----]

I think something similar to https://html.spec.whatwg.org/multipage/web-messaging.html#dom-broadcastchannel-postmessage could be done also in user-timing spec. See step 3 and its "Rethrow any exceptions."

https://w3c.github.io/user-timing/#dfn-performancemark-constructor has similar issue.

[mmocny]

Do you think just adding the wording "Rethrow any exceptions" would resolve this, or is it necessary to adjust how User Timing uses StructuredSerialize? Or is there an algorithm that the spec should point to instead of trying to match wording?

[smaug----]

Yes, I think "Rethrow any exceptions" should be enough.